Texas Instruments

UCC38C42D  

DC DC Switching Controllers

UCC38C42D Description

The UCC38C42D from Texas Instruments is an obsolete but robust offline PWM controller designed for high-performance DC-DC switching applications. This surface-mount IC features a transistor driver output with positive configuration, supporting boost, flyback, and forward converter topologies. Operating within a 9V to 18V supply range, it delivers switching frequencies up to 1MHz, making it suitable for high-efficiency power conversion. With a 96% maximum duty cycle and frequency control capabilities, it ensures precise regulation in demanding environments. The device is ROHS3 compliant and REACH unaffected, adhering to environmental standards while maintaining reliability in industrial settings.

UCC38C42D Features

• Output Type: Transistor driver (positive configuration) for direct MOSFET/transistor control.
• Wide Voltage Range: Operates from 9V to 18V, accommodating diverse power supply designs.
• High Switching Frequency: Supports up to 1MHz, enabling compact magnetics and faster transient response.
• Topology Flexibility: Optimized for boost, flyback, and forward converters.
• High Duty Cycle: 96% max duty cycle enhances efficiency in low-dropout scenarios.
• Robust Protection: Built-in undervoltage lockout (UVLO) ensures safe operation.
• Environmental Compliance: ROHS3 and REACH compliant, with MSL 1 (unlimited) moisture sensitivity.

UCC38C42D Applications

• AC/DC Power Supplies: Ideal for offline converters in industrial and consumer electronics.
• Isolated Power Modules: Used in telecom and server power systems due to its high-frequency capability.
• LED Drivers: Efficiently drives high-power LED arrays with precise current control.
• Auxiliary Power Supplies: Provides reliable bias power in motor drives and renewable energy systems.
• Battery Chargers: Suitable for fast-charging circuits leveraging its high-duty-cycle operation.

Conclusion of UCC38C42D

The UCC38C42D stands out for its high-frequency operation, wide input voltage range, and topology versatility, making it a strong choice for offline power conversion. While obsolete, its performance benefits—such as 96% duty cycle and 1MHz switching—remain valuable in legacy designs or niche applications requiring robust PWM control. Engineers seeking alternatives should consider newer TI controllers, but the UCC38C42D’s legacy of reliability in industrial and power supply applications ensures its continued relevance in specific use cases.

UCC38C42D Documents

Download datasheets and manufacturer documentation for UCC38C42D

EOL :

Product Discontinuance Notification (PDF)      

Images :

Mechanical Outline Drawing       Function Diagram      

PCN :

Qualification of Alternate Material Set for Assembly with Au Wire and Cu as Additional Wire Base Metal Option for Select SOIC and SSOP Package Devices (PDF)       Product Change Notification (PDF)      

Product Catalogs :

Power Management Guide 2018 (Rev. R)      

Technical Resources :

UCC28C42 TINA-TI Transient Start-up Reference Design       UCC28C42 TINA-TI Transient Steady State Reference Design      

SPICE Models :

UCC28C42 PSpice Transient Model       UCC28C42 TINA-TI Transient Start-up Spice Model       UCCx8C42 Unencrypted PSpice Transient Model       UCC28C42 TINA-TI Transient Steady State Spice Model